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| author | jhibbits <jhibbits@FreeBSD.org> | 2016-04-10 15:48:09 +0000 |
|---|---|---|
| committer | jhibbits <jhibbits@FreeBSD.org> | 2016-04-10 15:48:09 +0000 |
| commit | 19c7765e37f00e2171f79cbe90f99eeda55e07c9 (patch) | |
| tree | 9888c7cc029b8836d6c4a50a3009dc4fa4e5b6d3 /sys/powerpc/include | |
| parent | aac70308f6035bbde1587853967f26e436371d63 (diff) | |
| download | FreeBSD-src-19c7765e37f00e2171f79cbe90f99eeda55e07c9.zip FreeBSD-src-19c7765e37f00e2171f79cbe90f99eeda55e07c9.tar.gz | |
Restructure device mappings for Book-E.
Summary:
There is currently a 1GB hole between user and kernel address spaces
into which direct (1:1 PA:VA) device mappings go. This appears to go largely
unused, leaving all devices to contend with the 128MB block at the end of the
32-bit space (0xf8000000-0xffffffff). This easily fills up, and needs to be
densely packed. However, dense packing wastes precious TLB1 space, of which
there are only 16 (e500v2) or 64(e5500) entries available.
Change this by using the 1GB space for all device mappings, and allow the kernel
to use the entire upper 1GB for KVA. This also allows us to use sparse device
mappings, freeing up TLB entries.
Test Plan: Boot tested on p5020.
Differential Revision: https://reviews.freebsd.org/D5832
Diffstat (limited to 'sys/powerpc/include')
| -rw-r--r-- | sys/powerpc/include/vmparam.h | 2 |
1 files changed, 1 insertions, 1 deletions
diff --git a/sys/powerpc/include/vmparam.h b/sys/powerpc/include/vmparam.h index 0dd74c9..d7368ec 100644 --- a/sys/powerpc/include/vmparam.h +++ b/sys/powerpc/include/vmparam.h @@ -111,7 +111,7 @@ #define KERNBASE 0xc0000000 /* start of kernel virtual */ #define VM_MIN_KERNEL_ADDRESS KERNBASE -#define VM_MAX_KERNEL_ADDRESS 0xf7ffffff +#define VM_MAX_KERNEL_ADDRESS 0xffffffff #define VM_MAX_SAFE_KERNEL_ADDRESS VM_MAX_KERNEL_ADDRESS #endif /* AIM/E500 */ |
